[Bug 1921915] Re: Bluetooth controller not detected on CM4

[William Wilson]

** Patch added: "Focal SRU"
   https://bugs.launchpad.net/ubuntu/+source/pi-bluetooth/+bug/1921915/+attachment/5492485/+files/lp1921915_focal.debdiff

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https://bugs.launchpad.net/bugs/1921915

Title:
  Bluetooth controller not detected on CM4

Status in pi-bluetooth package in Ubuntu:
  Fix Released
Status in pi-bluetooth source package in Focal:
  In Progress
Status in pi-bluetooth source package in Groovy:
  In Progress
Status in pi-bluetooth source package in Hirsute:
  Fix Released

Bug description:
  Under later versions of the Ubuntu kernel (5.8) on the CM4 and
  (possibly?) some models of the Pi 400, the bluetooth controller is not
  activated by the pi-bluetooth package. This appears to be due to two
  issues:

  * The mmcnr device is mistaken for a bluetooth controller. This in
  itself is harmless, but results in a spurious hci0 device. The
  existence of this device causes the btuart script to skip configuring
  the "real" bluetooth device (as it thinks it is already configured)

  * The btuart script also attempts a match against the device-tree's
  model name looking for "Raspberry Pi 4" which doesn't match "Raspberry
  Pi Compute Module 4".

  The upstream repository currently has commits for both these fixes but
  no release has been made yet. It is proposed to backport these patches
  into an -ubuntu2 version of the package in the meantime.

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